Main Article Content
The study investigated the enhancement of students achievement and retention in Physics using Just-in-Time Instructional Strategy (JiTIS) in Adeyemi College of Education, Ondo, Nigeria. The study adopted pretest-posttest non-randomised control group in quasi experimental design. 100 students in their intact classes from the two randomly selected departments (Physics and Chemistry) were used for the study. Physics Achievement Test (PAT) with internal consistency of 0.76 using Kuder-Richardson formula 21 was used to gather data. The data collected were analysed using Analysis of Covariance (ANCOVA). The result showed that, students taught with JiTIS achieved and retained significantly better than those taught with expository method in Physics. Also, the influence of gender on students achievement in Physics was not significant. The results also indicated that, the effects of treatment and gender on each other are the same at all levels. It is recommended among others that, JiTIS should be adopted in tertiary institutions in Nigeria to teach various Physics courses for both undergraduate and postgraduate students. Also, adequate facilities and materials, both manual and electronic should be provided in the library by the government in order for the students to have access to electronic data-base and e-learning for effective utilization of JiTIS.